Ajinomoto Co., Ltd.

Ranko Nishi

Hisao Ito

Yuji Joe

Atsuko Takai

Yoshihiko Hara

Hiroshi Izui

Jun Nakamura

A microorganism which has an L-amino acid producing ability and has been modified so that succinate dehydrogenase activity and &#x3b1;-ketoglutarate dehydrogenase activity are decreased is cultured in a medium to produce and accumulate an L-amino acid in the medium or cells of the microorganism, and the L-amino acid is collected from the medium or cells to produce the L-amino acid.

Method for producing an L-amino acid

The present invention describes the production of L-tyrosine by culturing in a medium anbacterium which has L-tyrosine-producing ability and which carries a mutant prephenate dehydrogenase which is desensitized to feedback inhibition by L-tyrosine, producing and accumulating L-tyrosine in the medium or in the bacterial cells, and collecting L-tyrosine from the medium or the bacterial cells.

L-tyrosine producing bacterium and a method for producing L-tyrosine

L-tyrosine-producing bacterium and a method for producing L-tyrosine

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Kawasaki, Japan

Ranko Nishi